介孔炭的直接制备及其电化学性能研究

Direct Preparation of Mesoporous Carbons and Their Electrochemical Performances

以柠檬酸镁为原料,采用直接碳化法制备介孔炭电极材料。N2吸附测试表明,所制备多孔炭的比表面积达2 000 m2·g-1左右,介孔孔容和平均孔径随着炭化温度的升高而增加,当炭化温度大于800℃时,能够制备出以介孔结构为主的多孔炭材料。电化学测试表明,MgC-800和MgC-900具有优异的电化学电容特性。与硬模板法制备的OMC相比,MgC-800和MgC-900在实验电流密度范围内具有更大的比电容值,这应当归功于它们巨大的比表面积以及有利于电解质离子扩散的介孔结构。

Mesoporous electrode materials were prepared directly from magnesium citrate.N2 adsorption shows that the specific surface area of the porous carbons prepared amounts to approximate 2 000 m^2·g^-1,and that mesopore size and volume increase with the rise of carbonization temperature.Typical meso-structured porous carbon can be prepared when carbonization temperature is higher than 800 ℃.Electrochemical measurements demonstrate that MgC-800 and MgC-900 possess good capacitive behavior.Compared to hard-templated OMC,MgC-800 and MgC-900 have lager specific capacitance within the applied current densities in this work,which can be ascribed to their large surface area and mesoporous structure that favors fast electrolyte diffusion in the pore channels.